590
FNCA52 TJSJ 310918
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
518 AM AST SAT JAN 31 2026
DISCUSSION
SHOWERY WEATHER CONDITIONS ARE EXPECTED TODAY, MAINLY ALONG THE
SOUTHERN COAST OF PUERTO RICO. THEREFORE, RELATIVE HUMIDITIES AND
FUEL MOISTURE CONTENT SHOULD REMAIN ABOVE CRITICAL FIRE WEATHER
THRESHOLDS, AND THE FIRE DANGER WILL BE LOW. HOWEVER, GUSTY WINDS
BETWEEN 20 AND 25 MPH FROM THE SE CAN BE EXPECTED ALONG THE
SOUTHERN COASTAL AREAS.
PRZ014-010930-
SOUTHEAST COASTAL PLAINS-
518 AM AST SAT JAN 31 2026
TODAY TONIGHT SUN
CLOUD COVER MCLDY MCLDY PCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 80 80 40
TEMP (24H TREND) 86 (+1) 71 (-1) 85
RH % (24H TREND) 68 (+3) 98 (+3) 71
WIND 20FT/EARLY(MPH) SE 14 G19 SE 13 G17 S 11
WIND 20FT/LATE(MPH) SE 14 G19 SE 13 G17 S 11
MIXING HGT(FT-AGL/MSL)3880 3000
TRANSPORT WND (MPH) SE 16 S 10
VENT RATE (KT-FT) 54320 27000
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-010930-
SOUTHERN HILLS-
518 AM AST SAT JAN 31 2026
TODAY TONIGHT SUN
CLOUD COVER MCLDY MCLDY PCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 80 70 40
TEMP (24H TREND) 82 (+2) 68 (-2) 81
RH % (24H TREND) 74 (+3) 99 (+4) 77
WIND 20FT/EARLY(MPH) SE 13 SE 12 S 11
WIND 20FT/LATE(MPH) SE 13 SE 12 S 11
MIXING HGT(FT-AGL/MSL)4670 3760
TRANSPORT WND (MPH) SE 17 S 12
VENT RATE (KT-FT) 70050 37600
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-010930-
NORTH COASTAL PLAINS-
518 AM AST SAT JAN 31 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 60 60 70
TEMP (24H TREND) 87 (+3) 70 (0) 88
RH % (24H TREND) 64 (-5) 100 (+2) 63
WIND 20FT/EARLY(MPH) SE 14 G17 SE 13 S 14 G17
WIND 20FT/LATE(MPH) SE 14 G17 SE 13 S 14 G17
MIXING HGT(FT-AGL/MSL)4070 4310
TRANSPORT WND (MPH) SE 14 S 13
VENT RATE (KT-FT) 48840 47410
DISPERSION 5 5
DSI 6 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-010930-
NORTHERN HILLS-
518 AM AST SAT JAN 31 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 60 40 70
TEMP (24H TREND) 86 (+3) 69 (+1) 86
RH % (24H TREND) 63 (-4) 99 (+2) 64
WIND 20FT/EARLY(MPH) SE 12 SE 10 S 13
WIND 20FT/LATE(MPH) SE 12 SE 10 S 13
MIXING HGT(FT-AGL/MSL)5190 4500
TRANSPORT WND (MPH) SE 15 S 12
VENT RATE (KT-FT) 67470 45000
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-010930-
WEST COAST-
518 AM AST SAT JAN 31 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLDY PCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 60 60 50
TEMP (24H TREND) 88 (+2) 71 (+1) 87
RH % (24H TREND) 66 (+1) 100 (+5) 70
WIND 20FT/EARLY(MPH) SE 18 SE 17 S 13
WIND 20FT/LATE(MPH) SE 18 SE 17 S 13
MIXING HGT(FT-AGL/MSL)4690 3390
TRANSPORT WND (MPH) SE 20 S 16
VENT RATE (KT-FT) 79730 47460
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-010930-
EASTERN INTERIOR-
518 AM AST SAT JAN 31 2026
TODAY TONIGHT SUN
CLOUD COVER MCLDY MCLDY PCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 70 80 60
TEMP (24H TREND) 83 (+2) 70 (0) 84
RH % (24H TREND) 72 (0) 99 (+1) 70
WIND 20FT/EARLY(MPH) SE 16 SE 16 S 12
WIND 20FT/LATE(MPH) SE 16 SE 16 S 12
MIXING HGT(FT-AGL/MSL)4090 3820
TRANSPORT WND (MPH) SE 16 S 16
VENT RATE (KT-FT) 57260 53480
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-010930-
LUQUILLO MOUNTAIN RANGE-
518 AM AST SAT JAN 31 2026
TODAY TONIGHT SUN
CLOUD COVER MCLDY CLOUDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 70 80 70
TEMP (24H TREND) 78 (+1) 67 (-2) 79
RH % (24H TREND) 78 (0) 100 (0) 77
WIND 20FT/EARLY(MPH) SE 13 SE 13 S 10
WIND 20FT/LATE(MPH) SE 13 SE 13 S 10
MIXING HGT(FT-AGL/MSL)3280 3110
TRANSPORT WND (MPH) SE 18 S 16
VENT RATE (KT-FT) 52480 43540
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-010930-
CENTRAL MOUNTAIN RANGE-
518 AM AST SAT JAN 31 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLDY PCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 70 50 60
TEMP (24H TREND) 83 (+4) 67 (0) 82
RH % (24H TREND) 68 (-2) 100 (+3) 71
WIND 20FT/EARLY(MPH) SE 14 SE 13 S 13
WIND 20FT/LATE(MPH) SE 14 SE 13 S 13
MIXING HGT(FT-AGL/MSL)5420 4530
TRANSPORT WND (MPH) SE 17 S 14
VENT RATE (KT-FT) 81300 54360
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-010930-
CAYEY MOUNTAIN RANGE-
518 AM AST SAT JAN 31 2026
TODAY TONIGHT SUN
CLOUD COVER MCLDY CLOUDY PCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 80 80 50
TEMP (24H TREND) 77 (0) 68 (-1) 79
RH % (24H TREND) 82 (+4) 100 (+1) 82
WIND 20FT/EARLY(MPH) SE 11 SE 10 S 10
WIND 20FT/LATE(MPH) SE 11 SE 10 S 10
MIXING HGT(FT-AGL/MSL)3620 3030
TRANSPORT WND (MPH) SE 17 S 16
VENT RATE (KT-FT) 54300 42420
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-010930-
VIEQUES-
518 AM AST SAT JAN 31 2026
TODAY TONIGHT SUN
CLOUD COVER MCLDY MCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 70 70 70
TEMP (24H TREND) 85 (0) 72 (-1) 85
RH % (24H TREND) 63 (0) 96 (+1) 63
WIND 20FT/EARLY(MPH) SE 18 G22 SE 18 G23 S 16 G19
WIND 20FT/LATE(MPH) SE 18 G22 SE 18 G23 S 16 G19
MIXING HGT(FT-AGL/MSL)2920 2520
TRANSPORT WND (MPH) E 21 SE 20
VENT RATE (KT-FT) 52560 42840
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-010930-
CULEBRA-
518 AM AST SAT JAN 31 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLDY PCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 60 70 60
TEMP (24H TREND) 85 (0) 74 (-1) 87
RH % (24H TREND) 65 (0) 95 (+4) 63
WIND 20FT/EARLY(MPH) SE 18 G22 SE 18 G23 S 16 G20
WIND 20FT/LATE(MPH) SE 18 G22 SE 18 G23 S 16 G20
MIXING HGT(FT-AGL/MSL)2950 2650
TRANSPORT WND (MPH) SE 21 SE 23
VENT RATE (KT-FT) 53100 53000
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-010930-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
518 AM AST SAT JAN 31 2026
TODAY TONIGHT SUN
CLOUD COVER MCLDY MCLDY PCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 80 80 40
TEMP (24H TREND) 87 (+1) 72 (0) 87
RH % (24H TREND) 65 (+3) 97 (+6) 67
WIND 20FT/EARLY(MPH) SE 19 G24 SE 18 G23 SE 14 G20
WIND 20FT/LATE(MPH) SE 19 G24 SE 18 G23 SE 14 G20
MIXING HGT(FT-AGL/MSL)4270 3300
TRANSPORT WND (MPH) SE 20 S 12
VENT RATE (KT-FT) 72590 33000
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-010930-
SAINT THOMAS AND SAINT JOHN-
518 AM AST SAT JAN 31 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 50 40 60
TEMP (24H TREND) 85 (+1) 73 (-3) 85
RH % (24H TREND) 63 (-2) 95 (+6) 63
WIND 20FT/EARLY(MPH) SE 18 G23 SE 18 G23 SE 16 G19
WIND 20FT/LATE(MPH) SE 18 G23 SE 18 G23 SE 16 G19
MIXING HGT(FT-AGL/MSL)3250 3160
TRANSPORT WND (MPH) SE 21 SE 20
VENT RATE (KT-FT) 58500 53720
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-010930-
ST CROIX-
518 AM AST SAT JAN 31 2026
TODAY TONIGHT SUN
CLOUD COVER MCLDY PCLDY PCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 60 40 50
TEMP (24H TREND) 86 (+1) 74 (-1) 86
RH % (24H TREND) 65 (-2) 93 (+2) 63
WIND 20FT/EARLY(MPH) SE 18 G23 SE 17 G21 SE 16 G20
WIND 20FT/LATE(MPH) SE 18 G23 SE 17 G21 SE 16 G20
MIXING HGT(FT-AGL/MSL)3780 3690
TRANSPORT WND (MPH) E 23 SE 20
VENT RATE (KT-FT) 75600 62730
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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